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Table 1 <br /> Summary of Results of Ground Water Sampling <br /> Chevron Service Station 0 9-6465 <br /> 5608 North Pershing Drive, Stockton, California <br /> Concentrations in parts per billion (ppb) <br /> WELL DATE OF CASING DEPTH GROUND TPH-G B T E X 1 ,2-DCA LAB <br /> ID SAMPLING/ ELEVATION TO WATER <br /> MONITORING WATER ELEVATION <br /> MW-11 03/19/90 7 84 --- --- -W-- --- --- --- NA <br /> MW-11 04/11/90 7 84 --- --- --- ND<O 3 ND<0 3 ND(O 3 -ND<O 6 --- GTEL <br /> MW-11 05/09/90 7 84 36 58 -28 74 ND<50 ND<0 3 ND<O 3 ND<0 3 ND<0 6 --- GTEL <br /> MW-11 08/17/90 7 84 --- --- 83 0 5 ND<O 3 ND<O 3 ND<0 6 ---- GTEL <br /> MW-11 10/22/90 7 84 --- --- --- --- ---- --- - --- NA <br /> MW--11 01/19/91 7 84 38 92 -31 08 140 1 4 2 17 --- SAL <br /> MW-11 07/21/91 7 84 39 57 -31 73 ND<50 ND<O 5 ND<0 5 ND(0 5 ND<O 5 --- SAL <br /> RINSATE 03/23/89 NA NA NA ND<500 ND<0 5 ND<0 5 ND<O 5 ND<O 5 --- SAL <br /> RINSATE 07/19/89 NA NA NA ND1500 ND<O 5 ND<Q 5 ND<O 5 ND<O 5 --- SAL <br /> RINSATE 07/14/90 NA NA NA ND<50 ND<O 3 ND<O 3 ND<O 3 ND<0 6 --- GTEL <br /> RINSATE 10/22/90 NA NA NA ND<50 ND<O 3 ND<O 3 ND<O 3 ND<O 6 --- GTEL <br /> RINSATE 01/19/91 NA NA NA ND<50 ND<O 5 ND<O 5 ND(0 5 ND<O 5 --- SAL <br /> RINSATE 07/21/91 NA NA NA ND<SO ND<O 5 ND<O 5 ND(0 5 ND<O 5 --- SAL <br /> TB 03/23/89 NA NA NA ND<500 ND<0 5 ND<O 5 ND<O 5 ND<O 5 ---- SAL <br /> TB 07/19/89 NA NA NA ND(S00 ND<0 5 ND0 5 ND<O 5 ND<O 5 --- SAL <br /> TB 10/05/89 NA NA NA ND(250 ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- PACE <br /> TB 05/09/90 NA NA NA ND<50 ND<O 3 ND(0 3 ND<O 3 ND<0 6 --- GTEL <br /> TB 07/04/90 NA NA NA ND<50 ND<0 3 ND<O 3 ND(0 3 ND<O 6 --- GTEL <br /> TS 08/17/90 NA NA NA ND<50 ND<O 3 0 3 ND<O 3 1 --- GTEL <br /> TB 10/22/90 NA NA NA ND<50 ND<O 3 ND<0 3 ND(0 3 ND<O 6 --- GTEL <br /> T8 01/19/91 NA NA NA ND<50 ND<O 5 ND<O 5 ND(0 5 ND<O 5 --- SAL <br /> TB-------07/21/91----NA----------------- NA ND-50 -----------5ND(O--------- 5 ---- 5 ND<O---- 5 --- SAL <br /> ------ ----- <br /> EXPLANATION OF ABBREVIATIONS <br /> --- <br /> TPH-G Total Petroleum Hydrocarbons as Gasoline ND Not Detected <br /> (EPA method 8015 modified) TB Trip Blank <br /> B Benzene (EPA method 8020 or 8240) D Duplicate <br /> T Toluene (EPA method 8020 or 8240) B & C Brown & Caldwell Labs <br /> E Ethylbenzene (EPA method 8020 or 8240) CCAS CCAS Labs <br /> X Xylenes (EPA method 8020 or 8240) SAL Superior Analytical Labs <br /> 1 ,2-DCA 1 ,2-Dichloroethane GTEL GTEL LABS <br /> --- Not Analyzed/Not Measured PACE PACE Labs <br /> NA Not Applicable/Not Available * Not sampled due to insufficient water in well <br /> ** Sampled separately to confirm results <br /> Note Top of casing and Ground Water Elevations are expressed as feet above mean sea level (NGVD -1929) <br /> -------------------------------------------------------------------------------------------------------------_---_-_--_-------- <br /> I <br /> 28-Aug-91 <br />